Drilling tool



FIG. 1 is a first elevation view of a drilling tool in accordance with the design.

FIG. 2 is a second elevation of the drilling tool of FIG. 1, viewed from a different angle.

FIG. 3 is a top plan view of the drilling tool; and,

FIG. 4 is a bottom plan view of the drilling tool.

It is to be understood that broken lines in the drawings are intended for illustrative purposes only, and do not form part of the claimed design. 

The ornamental design for a drilling tool, as shown and described. 